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Of all these choices OS X is the only one that is legally 'Unix'. The Unix trademark is owned by The Open Group, and to use the term Unix you have to meet sever
by JeremyChase 17y ago
Of all these choices OS X is the only one that is legally 'Unix'. The Unix trademark is owned by The Open Group, and to use the term Unix you have to meet several criteria and pay a substantial fee. The FOSS *nixes do generally meet the requirements, but do not pay the fee.
ta-da!